在传统奥氏体中锰钢中添加不同含量的合金元素Mo, Cr, Nb和RE进行复合合金化处理，测试了其导热性及切削加工性，研究了复合合金化对奥氏体中锰钢切削加工性的影响，建立了二级模糊综合评判模型，以奥氏体锰钢的硬度、抗拉强度、延伸率、冲击韧性和热导率作为影响因素，对切削加工性进行定量分析. 结果表明，复合合金化处理可一定程度上改善奥氏体锰钢的切削加工性，合金元素Mo, Cr和Nb含量分别为1.87wt%, 2.43wt%和0.059wt%时试样的刀具后刀面平均磨损宽度VB值比未经合金化处理的ZGMn13钢减少了14.3%. 用二级模糊综合评判模型对奥氏体锰钢的切削加工性进行评价，通过本模型获得的评价指标与刀具磨损实验获得的VB值相关性显著，相关系数为–0.87334，存在高度的线性负相关，评判结果与VB值基本一致，评判模型符合生产实际，结果准确有效.

Austenitic manganese steel has been widely used in various fields as wear-resisting material, but it belongs to the typical difficult-to-machine material with extremely poor cutting performance, which limites the scope of its application to a large extent. The composition of traditional austenite medium manganese steel added with Mo, Cr, Nb and RE to combine alloying treatment was studied. The thermal conductivity and machinability of prepared manganese alloy in the austenite was tested. The effect of composite alloying on machinability of austenitic manganese steel was explored. A second-level fuzzy comprehensive evaluation model to quantitatively analyze machinability with the austenitic manganese steel hardness, tensile strength, elongation, impact toughness and thermal conductivity as influencing factors was established. The results showed that the composite alloying treatment can improve machinability of austenitic manganese steel to a certain extent when contents of alloying elements Mo, Cr, Nb were 1.87wt%, 2.43wt% and 0.059wt%, the tool flank wear width (VB value) of the sample reduced by 14.3% compared to the non-alloyed ZGMn13. The correlation between the evaluation index obtained by the two-level fuzzy comprehensive evaluation model and the VB value obtained by the tool wear experiment was significant. The linear correlation coefficient was –0.87334, which indicated a high degree of linear negative correlation, and the result was generally consistent with the VB value. In this way, it is proved that the evaluation model adopted was in line with actual production, and the evaluation result was accurate and effective.